Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1998-07-13
2001-06-19
Gupta, Yogendra (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S101000, C510S102000, C510S103000, C510S199000, C510S238000, C510S253000, C405S198000, C405S198000, C405S198000, C405S302000, C405S302400, C405S302400
Reexamination Certificate
active
06248705
ABSTRACT:
TECHNICAL FIELD
The present invention relates to bleaching compositions, more particularly to stable perfumed acidic liquid compositions comprising a source of active oxygen. Said compositions are particularly suitable for the bleaching and cleaning of hard-surfaces including toilet bowls and the like.
Background
A great variety of bleaching and cleaning compositions have been described in the art. Bleaching/cleaning compositions comprising a source of active oxygen and being formulated at low pH are particularly interesting for the cleaning of hard-surfaces, especially for the hygienic cleaning of sanitary fittings such as toilet bowls and the like.
A drawback associated with liquid compositions comprising a source of active oxygen, and more particularly with liquid compositions comprising a source of active oxygen and being formulated at low pH, is that it is quite difficult to stably incorporate perfumes therein. Indeed, traditional perfumes are usually made by a blend of components including esters, chetones, aldehydes and the like. Said perfumes are sensitive to sources of active oxygen and/or to low pH. In other words, said perfumes show significant instability in liquid compositions comprising a source of active oxygen like persulphate salts or hydrogen peroxide, especially when formulated in highly acidic conditions.
Indeed, such perfumes are easily hydrolysed in the presence of low pH, especially at pH below 2. The result of such hydrolysis is that perfumes lose their original fragrance/smell.
Such perfumes like, for example, those commercially available from Dragoco under the name of Ultra clean plus® or Givaudian-Roure®, are easily oxidised by sources of active oxygen, leading thereby to a loss of the total amount of active perfumes resulting in a loss of their original fragrance/smell as well as to a loss of the total amount of active oxygen which would otherwise be available to perform its bleaching action on the surfaces to be treated.
In fact, bleaching species, like hydrogen peroxide and/or persulphate, not only decompose perfume components upon an oxidation mechanism, but also decompose themselves in the presence of perfumes, therefore leading to a lowering of the total level of the bleach in a liquid composition and especially in a highly acidic liquid composition, with consequent performance issues and chemical stability issues upon long storage periods.
It is therefore an object of the present invention to provide perfumed liquid compositions, especially perfumed highly acidic liquid compositions comprising a source of active oxygen which are chemically stable for long storage periods.
It is another object of the present invention to provide perfumed highly acidic liquid compositions comprising a source of active oxygen which deliver improved scent.
It is yet another object of the present invention to provide perfumed highly acidic liquid compositions comprising a source of active oxygen which deliver improved bleaching performance.
The present invention meets the above objects by incorporating a cyclic terpene/sesquiterpene perfume selected from the group of eucalyptol, cedrol, pinocarveolus, sesquiterpenic globulul alcohol and mixtures thereof, in an acidic liquid composition having a pH below 2, and comprising a source of active oxygen and a surfactant. More particularly, it has been found that said cyclic terpene/sesquiterpene perfumes and especially eucalyptol are insensitive to pH, especially highly acidic pH and to sources; of active oxygen. Thus, by incorporating such a perfume into a highly acidic liquid composition comprising a source of active oxygen and a surfactant excellent chemical stability is obtained upon long storage periods as well as improved scent and/or improved bleaching performance, as compared to the same composition but with another perfume, like, for instance, traditional blends of components like Ultra Clean Plus® commercially available from Dragoco. Indeed, the chemical decomposition of a source of active oxygen present in a liquid composition, especially in a highly acidic liquid composition, is reduced in the presence of said cyclic terpene/sesquiterpene perfumes like eucalyptol, as compared to other perfumes like Ultra Clean Plus® commercially available from Dragoco.
An advantage associated with the compositions of the present invention comprising said cyclic terpene/sesquiterpene perfumes like eucalyptol is that good bacterial performance is delivered. Indeed, the incorporation of said cyclic terpene/sesquiterpene perfumes like eucalyptol in for example a highly acidic liquid composition comprising a source of active oxygen and a surfactant, allows to reduce the total level of source of active oxygen necessary in said liquid composition to deliver a given disinfection performance as compared to the same composition but without said cyclic terpene/sesquiterpene perfumes like eucalyptol.
Another advantage of the incorporation of said cyclic terpene/sesquiterpene perfumes like eucalyptol in highly acidic liquid compositions comprising a source of active oxygen and a surfactant, is that said compositions may be easily formulated as thickened compositions. Indeed, it has been found that said cyclic terpene/sesquiterpene perfumes and especially eucalyptol have a minimal impact on viscosity. In other words, they allow to formulate stable perfumed acidic liquid compositions comprising a source of active oxygen and a surfactant, that still have high viscosity, despite the presence of perfumes, even at high levels. In fact, traditional perfumes like Ultra Clean Plus® commercially available from Dragoco, especially at high levels of said perfumes, are known to have a. general tendency to significantly decrease composition viscosity by changing laminar/micellar aggregation.
Furthermore, said cyclic terpene/sesquiterpene perfumes like eucalyptol are easily dissolved in water based matrix like the acidic liquid compositions of the present invention upon dissolution of low levels of surfactants. For example, when formulating the present compositions as thickened compositions, lower levels of cationic surfactants are needed to stably incorporate said cyclic terpene/sesquiterpene perfumes in the compositions herein while providing the desired viscosity to said compositions. In other words, the incorporation of such a cyclic terpene/sesquiterpene perfume, in a perfumed highly acidic liquid bleaching composition allows to achieve optimum rheology for hard-surfaces applications including vertical hard-surface applications with less surfactants than would otherwise be required with the presence of other perfumes instead of said perfume according to the present invention. This results in another advantage of the present invention which is the ease of spread and rinse of the compositions herein when applied on hard-surfaces. In fact, poor product rinsing is driven by the crystallisation of the layers of surfactants like cationic surfactants deposited onto a hard-surface, e.g. toilet blows. Once crystals are formed, they tightly encrust on the surface and cannot be easily removed without mechanical help, e.g. friction and/or rubbing. The use of said cyclic terpene/sesquiterpene perfumes like eucalyptol as the perfume to be incorporated in a perfumed highly acidic liquid bleaching composition allows the use of lower levels of surfactants like cationic surfactants, preventing and/or minimising thereby the crystal growth, and thus facilitating its rinse, this even after overnight application of said composition on a toilet bowl.
Yet another advantage is that the stable perfumed acidic liquid compositions of the present invention are efficient on various surfaces to clean various soils and stains. Additionally, said compositions, when used to treat hard-surfaces, especially toilet bowls, exhibit outstanding soil discoloration, soil solubilization and emulsification properties together with a germicidal action, this when used both neat or diluted.
EP-A-188 025 discloses liquid stable thickened low-pH bleaching compositions comprising an inorganic pero
Cardola Sergio
Pieroni Lucio
Scoccianti Raffaele
Boyer Charles
Camp Jason J.
Gupta Yogendra
The Procter & Gamble & Company
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